A new type of viscometer operated by electromagnetic force is described. Two versions of such an apparatus are presented, one involving the measurement of mechanical entities only, the other based upon the measurement of ionic current density and of a magnetic field. These viscometers are both closely related to ordinary flow viscometers since the force setting the liquid into motion acts directly on the liquid itself, with no mechanical moving part interposed. The force is much less intense than gravity and is easily adjusted at will down to very small values. For this reason and because of a better design of the channel in which the liquid flows, very low values of shear stress can be obtained; thus making the apparatus described ideal for use with non‐Newtonian liquids, like high polymeric solutions or suspensions of DNA. The fact that the liquid must be subjected to electrolysis is a serious drawback, which can be circumvented by resorting to relative measurements. Improvement of the apparatus is under study.